TEM-4 Oral Test is designed for second-year English majors in China to measure their English speaking skill.In this article,the author first gave an introduction to the purpose,format and content,and scoring criteria ...TEM-4 Oral Test is designed for second-year English majors in China to measure their English speaking skill.In this article,the author first gave an introduction to the purpose,format and content,and scoring criteria and procedures of the TEM-4 Oral Test.Then she evaluated the test on the aspects of validity,reliability and backwash.Though the test is feasible at present,it still has some problems in implementation.In the second section,the author also gave some advice on the improvement of the test.展开更多
Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor....Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor. The products w ere characterized by TEM, SEM, XRD, EDS and PL. The results show that the stoich iometric relation of as-synthesized molybdenum-tungsten oxide nanorods is Mo1.8W 16.2O49. The formation of molybdenum-tungsten oxide nanorod is related to SO42-.展开更多
文摘TEM-4 Oral Test is designed for second-year English majors in China to measure their English speaking skill.In this article,the author first gave an introduction to the purpose,format and content,and scoring criteria and procedures of the TEM-4 Oral Test.Then she evaluated the test on the aspects of validity,reliability and backwash.Though the test is feasible at present,it still has some problems in implementation.In the second section,the author also gave some advice on the improvement of the test.
文摘Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor. The products w ere characterized by TEM, SEM, XRD, EDS and PL. The results show that the stoich iometric relation of as-synthesized molybdenum-tungsten oxide nanorods is Mo1.8W 16.2O49. The formation of molybdenum-tungsten oxide nanorod is related to SO42-.